Is Glide Floss Safe?

The Short Answer

Oral-B Glide built its reputation on sliding effortlessly between teeth, but that slickness came from PTFE—the same chemical used to make Teflon cookware. In 2019, a landmark study linked the daily use of Glide floss to elevated levels of "forever chemicals" (PFAS) in the bloodstream.

In January 2026, Oral-B announced they reformulated Glide to remove PTFE. While this is a massive win for consumers, independent lab tests haven't yet broadly verified the new formula, and older PTFE-coated batches are still sitting on store shelves. Until the transition is complete and verified, we recommend avoiding Glide and using established PFAS-free alternatives.

Why This Matters

When you drag a chemically-coated string between your teeth, the friction leaves micro-abrasions on your gums. Your gums are highly vascular, providing a direct pathway for chemicals to enter your bloodstream. This isn't just a theoretical risk—blood tests confirm it happens. Is Dental Floss Safe

A major 2019 study by the Silent Spring Institute found that women who used Glide floss had significantly higher levels of PFHxS (a type of PFAS) in their blood. PFAS are notorious for persisting in the human body for years and are linked to thyroid disease, liver damage, and reproductive issues. Is There Pfas In Floss

The resulting backlash led to major legal action and widespread consumer outrage. Independent testing in 2022 found a staggering 248,900 ppm of organic fluorine in Glide, acting as a red-alert indicator for toxic forever chemicals. While Oral-B claims the new 2026 formula is clean, verifying the safety of the current shelf stock is nearly impossible right now. Which Floss Has Pfas

What's Actually In Glide Floss

• PTFE (Polytetrafluoroethylene) — The synthetic fluoropolymer that gives older Glide formulas their signature slickness. It is part of the PFAS family of "forever chemicals" and is actively being phased out in the 2026 reformulation.
• Flavoring & Synthetic Waxes — Most commercial flosses use petroleum-based waxes to bind artificial flavors to the string. These artificial waxes offer no oral health benefits. Waxed Vs Unwaxed Floss

What to Look For

Green Flags:

• Nylon, Silk, or Polyester — These materials naturally resist shredding without the need for toxic chemical coatings. What Floss Is Pfas Free
• Natural Waxes — Beeswax, candelilla wax, or carnauba wax provide enough glide without relying on petroleum or PFAS.

Red Flags:

• "Non-stick" or "Glides effortlessly" claims — In conventional floss, extreme slickness is almost always achieved using fluorinated chemicals.
• PTFE on the label — If you see polytetrafluoroethylene listed anywhere on your floss or dental tape, throw it out immediately.

The Best Options

If you want to avoid the reformulation guessing game, switch to a brand that has always prioritized clean ingredients. We recommend checking out our full deep dives on Is Dr Tungs Floss Clean and Is Cocofloss Clean.

The Bottom Line

1. Check your bathroom cabinet. If you have old boxes of Oral-B Glide, throw them away. The older formulas are confirmed to contain PTFE.

2. Don't trust the transition period. Even though Oral-B reformulated in early 2026, it takes months for old inventory to cycle out of retail stores. Safest Dental Floss

3. Switch to a textured floss. Expanding or woven flosses from clean brands actually remove more plaque than slippery PTFE floss anyway. Cocofloss Vs Regular Floss

FAQ

Does flossing with Glide cause cancer?

There is no direct evidence that using Glide floss alone causes cancer. However, the PTFE historically used in Glide is linked to elevated blood levels of PFAS. These chemicals are associated with an increased risk of kidney and testicular cancer, liver damage, and hormone disruption.

Is the new 2026 Glide formula safe?

We don't know yet. Oral-B's parent company stated in January 2026 that they removed PTFE from the product entirely. However, independent testing has not yet confirmed the total absence of PFAS in the new formula.

Does string floss work better than a Waterpik?

They do different things. String floss physically scrapes sticky plaque off the tooth surface, while a water flosser flushes out loose debris below the gumline. Dentists usually recommend using both. String Floss Vs Water Flosser

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